Messages in this thread | | | Subject | Re: [RFC 0/3] Unify CPU topology across ARM64 & RISC-V | From | Jeffrey Hugo <> | Date | Thu, 15 Nov 2018 11:31:33 -0700 |
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On 11/8/2018 6:50 PM, Atish Patra wrote: > The cpu-map DT entry in ARM64 can describe the CPU topology in > much better way compared to other existing approaches. RISC-V can > easily adopt this binding to represent it's own CPU topology. > Thus, both cpu-map DT binding and topology parsing code can be > moved to a common location so that RISC-V or any other > architecture can leverage that. > > The relevant discussion regarding unifying cpu topology can be > found in [1]. > > arch_topology seems to be a perfect place to move the common > code. I have not introduced any functional changes in the moved > to code. The only downside in this approach is that the capacity > code will be executed for RISC-V as well. But, it will exit > immediately after not able to find the appropriate DT node. If > the overhead is considered too much, we can always compile out > capacity related functions under a different config for the > architectures that do not support them. > > The patches have been tested for RISC-V and compile tested for > ARM64. > > The socket changes[2] can be merged on top of this series or vice > versa. > > [1] https://lkml.org/lkml/2018/11/6/19 > [2] https://lkml.org/lkml/2018/11/7/918 > > Atish Patra (3): > dt-binding: cpu-topology: Move cpu-map to a common binding. > cpu-topology: Move cpu topology code to common code. > RISC-V: Parse cpu topology during boot. > > Documentation/devicetree/bindings/arm/topology.txt | 475 ------------------- > .../devicetree/bindings/cpu/cpu-topology.txt | 526 +++++++++++++++++++++ > arch/arm64/include/asm/topology.h | 23 +- > arch/arm64/kernel/topology.c | 305 +----------- > arch/riscv/Kconfig | 1 + > arch/riscv/kernel/smpboot.c | 6 +- > drivers/base/arch_topology.c | 303 ++++++++++++ > include/linux/arch_topology.h | 23 + > include/linux/topology.h | 1 + > 9 files changed, 864 insertions(+), 799 deletions(-) > delete mode 100644 Documentation/devicetree/bindings/arm/topology.txt > create mode 100644 Documentation/devicetree/bindings/cpu/cpu-topology.txt >
I was interested in testing these on QDF2400, an ARM64 platform, since this series touches core ARM64 code and I'd hate to see a regression. However, I can't figure out what baseline to use to apply these. Different patches cause different conflicts of a variety of baselines I attempted.
What are these intended to apply to?
Also, you might want to run them through checkpatch next time. There are several whitespace errors.
-- Jeffrey Hugo Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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